In less than a day, an electrical storm unleashed nearly 8,000 lightning strikes that set more than 800 wildfires across Northern California -- a rare example of "dry lightning" that brought little or no rain but plenty of sparks to the state's parched forests and grasslands.

In less than a day, an electrical storm unleashed nearly 8,000 lightning strikes that set more than 800 wildfires across Northern California -- a rare example of "dry lightning" that brought little or no rain but plenty of sparks to the state's parched forests and grasslands.